Just experienced wierd PROBLEM. Can't explain details except that yesterday evening my sound was working perfectly. I use ALC1150 codec from Asrock z97 extreme 4 with dts NEO. This evening when i got back from work there is no sound at all.

How is this possible ?
Any suggestions?Step 1 - check to see if sound is muted (don't laugh, 8 out of 10 times that's the problem). And make sure volume is at an audible level.

Step 2 - look in DEVICE MANAGER - any yellow or red symbols?Step #3...make sure the speakers didn't come unplugged....Step #4 - Are speakers powered on and volume knob raised. As well as check cord from computer to speakers and make sure a CAT didnt bite through it etc if you own a cat.... *Yes this has happened.  I've solved the issue simply by reinstalling the drivers because i think some windows updates were installed during the night before the computer shut down. Replugged all the cables again and the optical cable from the receiver. Thanks for the recommendations.